Feed-water-heating apparatus.



. W. Wi'R.

FEED WATER HEATIFG APPARATUS. APPLICATION FILED APR, 2s 1911.

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Application filed April (38. 1917. @erial 1%. 165219.

declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and usethe same, referencebeing had to the accompanying drawand to letters or figures of referencewhich form a part of this marked thereon, specification.

r'lhis invention relates to the treatment of feed water in systems forcondensing steamand heating feed water in steamships.

The inventlon consists 111 a novel arrangeinent and combination ofmachinery and apparatus which will be described in the followingspecification and particularly delined in the annexed claims.

Referring to the accompanying drawing, which is diagrammatic a is themain condenser and his a pipe which leads from the bottom thereof to thesuction of a pump 0, which will be referred to as the water-extractionpump, is preferably of the centrifugal type and preferably located belowthe level of the, bottom of the condenser. 'lhis pump delivers the waterthrough. a non-return valve ml to a surface heater condenser it placedon the main feed pipe f. The water, after pass ing through the surfaceheater condenser is delivered to an elevated direct-contact heater vywhere it is hea'ted'by admixture with steam, say auxiliary exhauststeam? thence the Water passes to the boiler feed pump or nmps rsituated at a considerably lower From the pipe -b--or, if preferred,from the bottom of the main condenser.a pipe (which is preferably givenan upward turn) is led to a steam-jet air ejector g which is arranged todraw air-and vapor from the condenser and deliver it to thebefore-mentioned surface heater condenser The steam-jet steam, togetherwith the water vapor brought from the condenser with the air, iscondensed in this surface heater con denser, anddrains into a well h atthe bottom thereof. A pipe-m connects this well with the suction of thewater-extraction Specification of Letters Patent.

and whichv ma ta am... an, role,

' and permits of the discharge-tothe atmosphere of the air delivered bythe air ejector.

The air ejector is arrangedto deliver the air and vapor into the surfaceheater condenser at a pressure at or above atmosphere so that the aircan be discharged to the atmosphere' as before mentioned. Thewaterextraction pump should be arranged to deliver the water at such apressure as is required. to meet the conditions of the case.

This pressure is generally in the neighborhood of twenty-five pounds persquare inch above atmosphere.

The well or tank'which is at the bottom of (or in communication with)the direct-contact heater 'y, and which receives the comloined heatingsteam (condensed) andheated water-,may be, and preferably is, providedwith a float mechanism of well known or suitable type whereby, when thewater in said well or tankreaches a predetermined level, a cook or valveis opened 'on the steam pipe to the feed pump, and the feed pumpconsequently started and maintained in operation until the water levelagain falls.

ft is usual, in the employment of a direct contact heater, to furnishthe heater with an overflow pipe adapted-if or when the water shouldrise in the heater to an inconvenient height-to allow of the dischargeof the excess feed water to a feed or reserve tank. Such a pipe 2 ispreferably provided in the presentschenie andmay, if considerednecessary or advantageous, be furnished with a loaded valve 5: to allowof the existence within the heater of a pressure above, and also apressure below,atmo sphere. The pipe .2 conveys the excess water to thefeed tank t. The feed tank may be connected, by a pipe a furnished witha hand-controlled valve e, with-the main condenser or the suction of thewater-extraction pump.

The surface heater condenser. may be of any suitable surface type, thatis, any Slutable type in which the steam and water are llll Bil

kept separate and the heat transferred through metal surfaces. Aconvenient design in the present scheme is one in which the water passesthrough tubes extending between two tube plates at opposite ends of acylindrical vessel, the steam passing over the outside surfaces of thetubes. It is important to note that the Water side of the surface heatercondenser is subject to the pressure of discharge from thewater-extraction pump while the steam side is sub ject to atmospheric orsuper-atmospheric pressure.

Under normal conditions of working the water delivered by thewater-extraction pump is sufficient to condense the steam deprovided onthis pipe. By means of this V the feed water is.

pipe to a sufficient circulation can be maintained through the surfaceheater condenser as will enable the steam from the air ejector to becondensed at a time when the main condenser is receiving no exhauststeam or insuficient steam to furnish the requisite cooling water to thesurface heater condenser. In such a case the water-extraction pump iskept running, and forces water through the surface heater condenser--where it condenses the steam-and then through the pipe 20 to the maincondenser whence it is again drawn off by the waterextraction pump andpassed again-to the surface heater condenser. The water in this repeatedcirculation is prevented from getting objectionably hot by reason of thecooling efi'ect obtained by its passage through the main condenser.

It is to be noted that in the present scheme circulated in a perfectlyclosed system, never at any time having access to the atmosphere. Theair is separated from the water of condensation either be--,

fore, or immediately after, leaving the main condenser; and the Waterthereafter is afforded no opportunity of taking up air.

Having thus descri'hed my invention, what I claim as new and desire tosecure by Letters Patent is 1. In asteamship, in combination, a maincondenser, amain feed pipe, a pump for the withdrawal of the water ofcondensation, z'. a, the feed, water, from the said condenser, and thedelivery of the same under pressure into the said main feed pipe, asurface heater condenser on the said main feed pipe, a steam-jet airejector for the extraction of the air, with vapor, from the saidcondenser and the delivery of the same into the said surface heatercondenser, the said surface heater condenser being arranged for theheating of the feed water by the condensation of the steam from theejector, means for returning this condensed steam to the suction of thesaid pump, an elevated direct-contact heater on' the main feed pipebeyond the said surface heater condenser and arranged for the furtherheating of the feed Water by admixture with steam, a return pipeconnecting the main condenser with the main feed pipe at a point betweenthe surface heater condenser and the direct-contact heater, and ahand-controlled valve on the said return pipe.

2. In a steamship, in combination, a main condenser, a main feed pipe, apump for the withdrawal of the water of condensation, 2'. 6., the feedwater, from the said condenser, and the delivery of the same underpressure into the said main feed ipe, a surface heater condenser on thesai main feed pipe of which the water side is under the pressure ofdischarge from the said pump while thesteam side is under a pressure notless than atmospheric, a steam-jet air ejector for the extraction of theair, with vapor, from the said condenser and the delivery of the sameinto the said surface heater condenser, the said surface heatercondenser,

being arranged for the heating of the feed water by the condensation ofthe steam from the ejector, means for returning this condensed steam tothe suction of the said pump, an elevated direct-contact heater on themain feed pipe beyond the said surface heater condenser and arranged forthe further heating of the feed Water by admixture with steam, a returnpipe connectin the main condenser with the main feed pipe at a pointbetween the surface heater'condenser and the direct-contact heater, anda hand controlled valve on the said return pipe.

3. In a steamship, in combination, a main condenser, a main feedwithdrawal of the Water. cf condensation, i. e., the feed water, fromthe said condenser, and the delivery of the same under pressure into thesaid main feedpipe, a surface heater condenser on the said main feedpipe, a steam-jet air ejector for the extraction of the air, with vapor,from the said condenser and the delivery of the same into the saidsurface heater condenser, the said surface heater condenser beingarranged for the heatin of the feed water by the condensation'o thesteam from the ejector, awell at the bottom of the said surface heaterpipe, a pump for the condenser, a pipe connection fromthis'well 1naeaaer to the suction of the said pump, an elevated direct-contactheater on the main feed pipe beyond the said surface heater condenserand arranged for the further heating of the feed water by admixture withsteam, a return pipe connecting the main condenser With the main teedpipe at a point between the surface heater condenser and thedirectcontact heater, and a hand-controlled valve on, the said returnpipe.

4. In a steamship, in combination, a main condenser, a main feed pipe, apump for the Withdrawal of the Water of condensation, c. e., the feedWater, from the said condenser, and the delivery of the same underpressure into the said main feed pipe, a

surface heatercondenser on the said main feed pipe, a steam-jet air;ejector :tor the extraction of the air, with vapor, from the saidcondenser and the delivery of the same into the said surface heatercondenser, the

said surface heater condenser heing arranged for the heating of the feedWater by the condensation of the steam from the ejector, means forreturning this condensed steam to the suction of the said pump, anelevated direct-contact heater on the main teed pipe beyond the saidsurface heater condenser and arranged for the further heating of thefeed water by admixture with steam, a feed tank, a pipe connecting thesaid direct-contact heater with the said feed tank, a pipeconnecting thesaid feed tank with the suction of the said pump, a pipe connecting themain condenser with the main teed pipe at a point between the surfaceheater condenser and the direct-contact heater, and hand-controlledvalves on the last two mentioned pipes.

11 hereby sign my name to this specification.

- WEIR.

